Many people don't believe it, but it's a fact that the city of Semarang used to be under the sea 

Semarang is the capital of the province of Central Java, Indonesia. The city is located on the north coast of Java, or about 120 kilometers east of Jakarta. During the Dutch East Indies era, the city of Semarang was once dubbed the Venice van Java, because this city was crossed by several rivers, and the scenery was beautiful, as was the condition of the city of Venice in Italy. The Old Town area in Semarang also gets its own nickname, namely Little Netherland.
But did you know, if the city of Semarang in ancient times was submerged in the sea?